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while running ipmi, ipmi_smi_watcher_register() caused a suspicious RCU usage warning. ----- ============================= WARNING: suspicious RCU usage 5.10.0-rc3+ #1 Not tainted ----------------------------- drivers/char/ipmi/ipmi_msghandler.c:750 RCU-list traversed in non-reader section!! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 2 locks held by syz-executor.0/4254: stack backtrace: CPU: 0 PID: 4254 Comm: syz-executor.0 Not tainted 5.10.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/ 01/2014 Call Trace: dump_stack+0x19d/0x200 ipmi_smi_watcher_register+0x2d3/0x340 [ipmi_msghandler] acpi_ipmi_init+0xb1/0x1000 [acpi_ipmi] do_one_initcall+0x149/0x7e0 do_init_module+0x1ef/0x700 load_module+0x3467/0x4140 __do_sys_finit_module+0x10d/0x1a0 do_syscall_64+0x34/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x468ded ----- It is safe because smi_watchers_mutex is locked and srcu_read_lock has been used, so simply pass lockdep_is_held() to the list_for_each_entry_rcu() to suppress this warning. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com> Message-Id: <20201119070839.381-1-miaoqinglang@huawei.com> Signed-off-by: Corey Minyard <cminyard@mvista.com> |
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| .. | ||
| bt-bmc.c | ||
| ipmb_dev_int.c | ||
| ipmi_bt_sm.c | ||
| ipmi_devintf.c | ||
| ipmi_dmi.c | ||
| ipmi_dmi.h | ||
| ipmi_kcs_sm.c | ||
| ipmi_msghandler.c | ||
| ipmi_plat_data.c | ||
| ipmi_plat_data.h | ||
| ipmi_powernv.c | ||
| ipmi_poweroff.c | ||
| ipmi_si_hardcode.c | ||
| ipmi_si_hotmod.c | ||
| ipmi_si_intf.c | ||
| ipmi_si_mem_io.c | ||
| ipmi_si_parisc.c | ||
| ipmi_si_pci.c | ||
| ipmi_si_platform.c | ||
| ipmi_si_port_io.c | ||
| ipmi_si_sm.h | ||
| ipmi_si.h | ||
| ipmi_smic_sm.c | ||
| ipmi_ssif.c | ||
| ipmi_watchdog.c | ||
| Kconfig | ||
| kcs_bmc_aspeed.c | ||
| kcs_bmc_npcm7xx.c | ||
| kcs_bmc.c | ||
| kcs_bmc.h | ||
| Makefile | ||